Password Protect PDF Locally
Add a password so your PDF can't be opened without it.
Your password never leaves your device
The encryption runs in this browser tab. Neither the file nor the password is sent anywhere, so there's no copy of either on a server.
Standard encryption every reader understands
Files are protected with AES-128 in the standard PDF format, so Adobe Acrobat, Preview, Chrome and phone PDF apps all ask for the password.
How it works
- 1Drop in the PDF you want to protect.
- 2Choose a password and confirm it.
- 3Download the protected file — it'll ask for that password every time it's opened.
Questions people ask
Can I password protect PDF offline?
Yes. Once this page has loaded, protecting files keeps working with no internet connection, because everything happens on your device.
What encryption does this use?
AES-128, via the standard PDF encryption format that Adobe Acrobat and other readers support natively.
What if I forget the password?
We can't recover it for you — it's never sent or stored anywhere. If you lose it, the file is unreadable.
Does this restrict printing or copying too?
No — this only requires a password to open the file. It doesn't try to enforce printing/copying restrictions, which aren't reliably enforceable anyway.